Unit 04 Cell Membrane Structure and Function

1) Students will be able to understand and describe the concept of passive transport and cell regulation.

a) Diffusion is the random movement of a substance across the concentration gradient, from an area of high concentration to an area of low concentration.

(Click here for Video)

b) Osmosis is a special case of diffusion through a semi-permeable membrane that only occurs with water, due to hypertonic, hypotonic, and isotonic conditions.

(Click here for Video)

c) Facilitated diffusion uses carrier proteins to transport specific substances- amino acids, across the cell membrane, using the concentration gradient. (Click here for Video)

2) Students will be able to describe active transport and how it is used for cell regulation.

a) ATP energy is required by the cell to move substances against the concentration gradient. (Click here for Video)

b) The cell uses the sodium-potassium pump to actively regulate ions against the concentration gradient (Click Here for Video)

c) Using vesicles, endocytosis and exocytosis use energy to move large particles into and out of the cell.

(Click here for Video)

3) Students will be able to identify ways that receptor proteins aid the cell in communication. (Click here for Video)

a) A receptor protein binds to a specific signal molecule.

a) The second messenger acts as a signal molecule and amplifies the signal of the first messenger.

b) The receptor protein can act as an enzyme and speed up chemical reactions in the cell.

c) Drugs affect the signal molecules.

• Passive Transport

• Concentration Gradient

• Equilibrium

• Diffusion

• Osmosis

• Hypertonic Solution

• Hypotonic Solution

• Isotonic Solution

• Ion Channel

• Carrier Protein

• Facilitated Diffusion

• Active Transport

• Sodium-potassium Pump

• Endocytosis

• Exocytosis

• Receptor Protein

• Second Messenger